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參數(shù)資料
| 型號(hào)： | 16F876A |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 28/40-pin Enhanced FLASH Microcontrollers |
| 中文描述： | 28/40-pin增強(qiáng)閃存微控制器 |
| 文件頁(yè)數(shù)： | 100/222頁(yè) |
| 文件大?。?/td> | 4013K |
| 代理商： | 16F876A |
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PIC16F87XA
DS39582A-page 98
Advance Information
2001 Microchip Technology Inc.
9.4.9
I
2
C MASTER MODE REPEATED
START CONDITION TIMING
A Repeated START condition occurs when the RSEN
bit (SSPCON2<1>) is programmed high and the I
2
C
logic module is in the IDLE state. When the RSEN bit is
set, the SCL pin is asserted low. When the SCL pin is
sampled low, the baud rate generator is loaded with the
contents of SSPADD<5:0> and begins counting. The
SDA pin is released (brought high) for one baud rate
generator count (T
BRG
). When the baud rate generator
times out, if SDA is sampled high, the SCL pin will be
de-asserted (brought high). When SCL is sampled
high, the baud rate generator is reloaded with the con-
tents of SSPADD<6:0> and begins counting. SDA and
SCL must be sampled high for one T
BRG
. This action is
then followed by assertion of the SDA pin (SDA = 0) for
one T
BRG,
while SCL is high. Following this, the RSEN
bit (SSPCON2<1>) will be automatically cleared and
the baud rate generator will not be reloaded, leaving
the SDA pin held low. As soon as a START condition is
detected on the SDA and SCL pins, the S bit
(SSPSTAT<3>) will be set. The SSPIF bit will not be set
until the baud rate generator has timed out.
Immediately following the SSPIF bit getting set, the
user may write the SSPBUF with the 7-bit address in
7-bit mode, or the default first address in 10-bit mode.
After the first eight bits are transmitted and an ACK is
received, the user may then transmit an additional eight
bits of address (10-bit mode), or eight bits of data (7-bit
mode).
9.4.9.1
WCOL Status Flag
If the user writes the SSPBUF when a Repeated
START sequence is in progress, the WCOL is set and
the contents of the buffer are unchanged (the write
doesn’t occur).
FIGURE 9-20:
REPEAT START CONDITION WAVEFORM
Note 1:
If RSEN is programmed while any other
event is in progress, it will not take effect.
2:
A bus collision during the Repeated
START condition occurs if:
SDA is sampled low when SCL goes
from low to high.
SCL goes low before SDA is
asserted low. This may indicate that
another master is attempting to
transmit a data "1".
Note:
Because queueing of events is not
allowed, writing of the lower 5 bits of
SSPCON2 is disabled until the Repeated
START condition is complete.
SDA
SCL
Sr = Repeated START
Write to SSPCON2
occurs here.
Write to SSPBUF occurs here.
Falling edge of ninth clock
End of Xmit
At completion of START bit,
hardware clear RSEN bit
and set SSPIF
1st Bit
Set S (SSPSTAT<3>)
T
BRG
T
BRG
SDA = 1,
SCL (no change)
SDA = 1,
SCL = 1
T
BRG
T
BRG
T
BRG
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